this is man san francisco police knew mostly as wayne jackson. he had at least four aliases, and that's what threw police off his trail. >> based on jackson's description, his residence on masonic avenue, his ownership of a large black dog, and his criminal history, we are investigating jackson as a person of interest in this case. >> reporter: jackson was 6 feet tall, blond, and had a black dog, just like the person last seen talking to collins in february of 1984 at masonic and oak streets in san francisco. jackson lived on masonic. >> it's hard to look at it and not think, you know, that this is it, or this was very, very likely that this is what happened. >> reporter: kevin's brother steven found out last night from police that when kevin vanished, officers knew of jackson's 1991 connection to a kidnapping and molestation of a 7-year-old boy in san francisco. in february of '84, police interviewed jackson, and they searched his house. >> so that's my brother mike and myself here, gary, and kevin. >> reporter: but in 1984, police did not know